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How to track down a “double free or corruption” error
...{
char *x = malloc(100);
free(x);
free(x);
return 0;
}
[sand@PS-CNTOS-64-S11 testbox]$ vim t1.c
[sand@PS-CNTOS-64-S11 testbox]$ cc -g t1.c -o t1
[sand@PS-CNTOS-64-S11 testbox]$ ./t1
*** glibc detected *** ./t1: double free or corruption (top): 0x00000000058f7010 ***
======= Backtrace: =========...
How to compile a 64-bit application using Visual C++ 2010 Express?
Is there a simple way to compile a 64 bit app with the 32-bit edition of Visual C++ 2010 Express? What configurations, if any, are necessary?
...
Reference — What does this symbol mean in PHP?
...allbacks that are expected to return a zero, negative, or positive integer based on a three-way comparison between two values. The comparison function passed to usort is one such example.
Before PHP 7 you would write...
$arr = [4,2,1,3];
usort($arr, function ($a, $b) {
if ($a < $b) {
...
How do I upload a file with metadata using a REST web service?
...D": "7a788f56fa49ae0ba5ebde780efe4d6a89b5db47"
}
Including the file data base64 encoded into the JSON request itself will increase the size of the data transferred by 33%. This may or may not be important depending on the overall size of the file.
Another approach might be to use a POST of the ra...
What would cause an algorithm to have O(log n) complexity?
...f this.
Processing values one digit at a time
How many digits are in the base-10 number n? Well, if there are k digits in the number, then we'd have that the biggest digit is some multiple of 10k. The largest k-digit number is 999...9, k times, and this is equal to 10k + 1 - 1. Consequently, if...
Why is division in Ruby returning an integer instead of decimal value?
...it to learn what works best. Here's the benchmark I put together: require 'base64';require 'zlib';puts Zlib.inflate(Base64.decode64("eJxlkMEOwiAQRO98hekFuGzxQEwPXvwR01ZqiYHqBk2Tln8XDlWgnDbM25nJonq9NaoD7ZTtR9PigxK09zM7AkgRHieXTYHOsBNf1nklM6B6TuhYpdp+rPgSdiCOi/d/kQ71QBOtAVFLEDly05+UYQ2H+MckL6z0zioDdJG...
0.1 float is greater than 0.1 double. I expected it to be false [duplicate]
...= %.0001100110011001100110011001100110011001100110011010
Convert that to base 10:
float(.1) = .10000002384185791015625
double(.1) = .100000000000000088817841970012523233890533447265625
This was taken from an article written by Bruce Dawson. it can be found here:
Doubles are not floats, so don...
What is the advantage of GCC's __builtin_expect in if else statements?
...ect or not. On the other hand, the compiler can perform many optimizations based on the branch probability, such as organizing the code so the hot path is contiguous, moving code unlikely to be optimized further away or reducing its size, taking decisions about which branches to vectorize, better sc...
H2 in-memory database. Table not found
I've got a H2 database with URL "jdbc:h2:test" . I create a table using CREATE TABLE PERSON (ID INT PRIMARY KEY, FIRSTNAME VARCHAR(64), LASTNAME VARCHAR(64)); . I then select everything from this (empty) table using SELECT * FROM PERSON . So far, so good.
...
What are the calling conventions for UNIX & Linux system calls (and user-space functions) on i386 an
...int $0x80
http://www.int80h.org/bsdasm/#default-calling-convention
x86-64 Linux System Call convention:
x86-64 Mac OS X is similar but different. TODO: check what *BSD does.
Refer to section: "A.2 AMD64 Linux Kernel Conventions" of System V Application Binary Interface AMD64 Architecture Proc...